You can find out which ports are configured with:
[0:root@c3po selinux]$ semanage port -l | grep dhcpd
dhcpd_port_t tcp 547, 548, 647, 847, 7911
dhcpd_port_t udp 67, 547, 548, 647, 847
There are designated ports in /etc/services:
dhcp-failover 647/tcp # DHCP Failover
dhcp-failover 647/udp # DHCP Failover
dhcp-failover2 847/tcp # dhcp-failover 2
dhcp-failover2 847/udp # dhcp-failover 2
I use 647/847 on one failover pair and 520/520 on another which I don't recall
having to inform selinux about even though 520 is not in the policy.
FYI:
[0:root@c3po selinux]$ semanage port -l | grep -e 7911 -e 8118
dhcpd_port_t tcp 547, 548, 647, 847, *7911*
http_cache_port_t tcp 8080, *8118*, 8123, 10001-10010
Bill
On 11/2/2019 9:31 PM, Sam Varshavchik wrote:
Does anyone happen to know if the dhcp failover configuration that's documented here: https://kb.isc.org/docs/aa-00502 is
supported by Fedora's selinux policy. Perusing it, failover seems to use a dedicated port(s), so selinux needs to bless dhcp's
binding to that port(s).
I couldn't figure out what is or isn't in Fedora's selinux polixy by searching what's in the selinux-policy-targeted and
selinux-policy-devel rpms; and I was unable to find any useful selinux documentation, either in the supplied rpm or web searches.
It would be nice to know this in advance before attempting to wreck my LAN for an afternoon, trying to get this to work with
selinux enabled.
I thought I could determine whether Fedora's selinux with respect to dhcp and ports 647 and 7911 (the dhcpd.conf man pages
makes it clear that ports 519 and 520 from the above docs are outdated) by figuring out where is the selinux policy restricts
privoxy to port 8118; but a grep of all the files in selinux-policy-targeted or selinux-policy-devel finds nothing that
appears to specify that the privoxy_t domain is allowed to bind port 8118. The selinux-doc RPM appears to be just
robo-generated documentation that just repeats the stuff that I found in the other RPMs.
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